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<h3>
Richard Eisenberg pushed to branch wip/cfuneqcan-refactor
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/65a7815c04574e49e62cc457d8476287366f62a4">65a7815c</a></strong>
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<span>by Richard Eisenberg</span>
<i>at 2020-11-24T15:23:44-05:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove isTyVarHead
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<h4>1 changed file:</h4>
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<a href="#0c6b585a8a21f8340a85ca2cef89c4b1bf5a8953">
compiler/GHC/Tc/Solver/Monad.hs
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<h4>Changes:</h4>
<li id="0c6b585a8a21f8340a85ca2cef89c4b1bf5a8953">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/65a7815c04574e49e62cc457d8476287366f62a4#0c6b585a8a21f8340a85ca2cef89c4b1bf5a8953"><strong>compiler/GHC/Tc/Solver/Monad.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1008,7 +1008,7 @@ now reduced to reflexivity.</td>
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1008
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1008
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<pre style="margin: 0;"> <span id="LC1008" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The solution here is to kick out representational inerts whenever the</span></span>
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1009
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<pre style="margin: 0;"> <span id="LC1009" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">tyvar of a work item is "exposed", where exposed means being at the</span></span>
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1010
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1010
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<pre style="margin: 0;"> <span id="LC1010" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">head of the top-level application chain (a t1 .. tn). See</span></span>
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1011
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<pre style="margin: 0;">-<span id="LC1011" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">TcType.isTyVarH</span>ead. This is encoded in (K3b).</span></span>
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<pre style="margin: 0;">+<span id="LC1011" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">is_can_eq_lhs_h</span>ead. This is encoded in (K3b).</span></span>
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1012
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<pre style="margin: 0;"> <span id="LC1012" class="line" lang="haskell"></span>
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1013
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<pre style="margin: 0;"> <span id="LC1013" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Beware: if we make this test succeed too often, we kick out too much,</span></span>
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1014
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<pre style="margin: 0;"> <span id="LC1014" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and the solver might loop. Consider (#14363)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1779,18 +1779,33 @@ kick_out_rewritable new_fr new_lhs</td>
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1779
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<pre style="margin: 0;"> <span id="LC1779" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (K2c) is guaranteed by the first guard of keep_eq</span></span>
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<pre style="margin: 0;"> <span id="LC1780" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1781" class="line" lang="haskell"> <span class="n" style="color: #333;">kick_out_for_completeness</span> <span class="c1" style="color: #998; font-style: italic;">-- (K3) and Note [K3: completeness of solving]</span></span>
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<pre style="margin: 0;">-<span id="LC1782" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="p">(</span><span class="n" style="color: #333;">eq_rel</span><span class="p">,</span> <span class="n" style="color: #333;">new_lhs</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1783
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<pre style="margin: 0;">-<span id="LC1783" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NomEq</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">rhs_ty</span> <span class="p">`</span><span class="n" style="color: #333;">eqType</span><span class="p">`</span> <span class="n" style="color: #333;">canEqLHSType</span> <span class="n" style="color: #333;">new_lhs</span> <span class="c1" style="color: #998; font-style: italic;">-- (K3a)</span></span>
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<pre style="margin: 0;">-<span id="LC1784" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ReprEq</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TyVarLHS</span> <span class="n" style="color: #333;">new_tv</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">isTyVarHead</span> <span class="n" style="color: #333;">new_tv</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="c1" style="color: #998; font-style: italic;">-- (K3b)</span></span>
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<pre style="margin: 0;">-<span id="LC1785" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ReprEq</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TyFamLHS</span> <span class="n" style="color: #333;">new_tf</span> <span class="n" style="color: #333;">new_tf_args</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- (K3b)</span></span>
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1786
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<pre style="margin: 0;">-<span id="LC1786" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">rhs_tc</span><span class="p">,</span> <span class="n" style="color: #333;">rhs_tc_args</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSplitTyConApp_maybe</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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<pre style="margin: 0;">-<span id="LC1787" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcEqTyConApps</span> <span class="n" style="color: #333;">new_tf</span> <span class="n" style="color: #333;">new_tf_args</span> <span class="n" style="color: #333;">rhs_tc</span> <span class="n" style="color: #333;">rhs_tc_args</span></span>
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<pre style="margin: 0;">-<span id="LC1788" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">-<span id="LC1789" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;">-<span id="LC1790" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">+<span id="LC1782" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">eq_rel</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1783
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<pre style="margin: 0;">+<span id="LC1783" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NomEq</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">rhs_ty</span> <span class="p">`</span><span class="n" style="color: #333;">eqType</span><span class="p">`</span> <span class="n" style="color: #333;">canEqLHSType</span> <span class="n" style="color: #333;">new_lhs</span> <span class="c1" style="color: #998; font-style: italic;">-- (K3a)</span></span>
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1784
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<pre style="margin: 0;">+<span id="LC1784" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ReprEq</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">is_can_eq_lhs_head</span> <span class="n" style="color: #333;">new_lhs</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="c1" style="color: #998; font-style: italic;">-- (K3b)</span></span>
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1791
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1785
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<pre style="margin: 0;"> <span id="LC1785" class="line" lang="haskell"></span>
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1792
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1786
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<pre style="margin: 0;"> <span id="LC1786" class="line" lang="haskell"> <span class="n" style="color: #333;">kick_out_eq</span> <span class="n" style="color: #333;">ct</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"keep_eq"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span></span>
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1793
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1787
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<pre style="margin: 0;"> <span id="LC1787" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1788" class="line" lang="haskell"> <span class="n" style="color: #333;">is_can_eq_lhs_head</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyVarLHS</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span></span>
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<pre style="margin: 0;">+<span id="LC1789" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1790
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<pre style="margin: 0;">+<span id="LC1790" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rep</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">TyVarTy</span> <span class="n" style="color: #333;">tv'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">tv'</span></span>
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1791
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<pre style="margin: 0;">+<span id="LC1791" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rep</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">AppTy</span> <span class="n" style="color: #333;">fun</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">fun</span></span>
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1792
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<pre style="margin: 0;">+<span id="LC1792" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rep</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">CastTy</span> <span class="n" style="color: #333;">ty</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty</span></span>
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1793
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<pre style="margin: 0;">+<span id="LC1793" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rep</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">TyConApp</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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1794
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<pre style="margin: 0;">+<span id="LC1794" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rep</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">LitTy</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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1795
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<pre style="margin: 0;">+<span id="LC1795" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rep</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">ForAllTy</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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1796
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<pre style="margin: 0;">+<span id="LC1796" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rep</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">FunTy</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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1797
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<pre style="margin: 0;">+<span id="LC1797" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rep</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">CoercionTy</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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1798
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<pre style="margin: 0;">+<span id="LC1798" class="line" lang="haskell"> <span class="n" style="color: #333;">is_can_eq_lhs_head</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyFamLHS</span> <span class="n" style="color: #333;">fun_tc</span> <span class="n" style="color: #333;">fun_args</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span></span>
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1799
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<pre style="margin: 0;">+<span id="LC1799" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1800" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1800
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<pre style="margin: 0;">+<span id="LC1800" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rep</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">TyVarTy</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1801" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1801
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<pre style="margin: 0;">+<span id="LC1801" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rep</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">AppTy</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="c1" style="color: #998; font-style: italic;">-- no TyConApp to the left of an AppTy</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1802" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1802
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<pre style="margin: 0;">+<span id="LC1802" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rep</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">CastTy</span> <span class="n" style="color: #333;">ty</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1803" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1803
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<pre style="margin: 0;">+<span id="LC1803" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rep</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">TyConApp</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcEqTyConApps</span> <span class="n" style="color: #333;">fun_tc</span> <span class="n" style="color: #333;">fun_args</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">args</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1804" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1804
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<pre style="margin: 0;">+<span id="LC1804" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rep</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">LitTy</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1805" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1805
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<pre style="margin: 0;">+<span id="LC1805" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rep</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">ForAllTy</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1806" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1806
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<pre style="margin: 0;">+<span id="LC1806" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rep</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">FunTy</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1807" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1807
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<pre style="margin: 0;">+<span id="LC1807" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rep</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">CoercionTy</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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1808
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<pre style="margin: 0;">+<span id="LC1808" class="line" lang="haskell"></span>
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1794
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1809
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<pre style="margin: 0;"> <span id="LC1809" class="line" lang="haskell"><span class="n" style="color: #333;">kickOutAfterUnification</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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1795
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1810
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<pre style="margin: 0;"> <span id="LC1810" class="line" lang="haskell"><span class="n" style="color: #333;">kickOutAfterUnification</span> <span class="n" style="color: #333;">new_tv</span></span>
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<td class="diff-line-num old_line" data-linenumber="1796" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1796
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1811
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<pre style="margin: 0;"> <span id="LC1811" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">ics</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getInertCans</span></span>
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